From: Sricharan R <sricharan@codeaurora.org>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>, vkoul@kernel.org
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH] dmaengine: qcom-bam: fix circular buffer handling
Date: Tue, 18 Jun 2019 21:57:49 +0530 [thread overview]
Message-ID: <a50066ac-be85-6706-e7f3-f1069fd0dd0b@codeaurora.org> (raw)
In-Reply-To: <544851f6-58b8-2506-01ce-5c4d1f93fb3c@linaro.org>
On 6/18/2019 8:42 PM, Srinivas Kandagatla wrote:
>
>
> On 18/06/2019 15:56, Sricharan R wrote:
>> So MAX_DESCRIPTORS is used in driver for masking head/tail pointers.
>> That's why we have to pass MAX_DESCRIPTORS + 1 so that it works
>> when the Macros does a size - 1
> Isn't that incorrect to do that, pretending to have more descriptors than we actually have?
>
The Macro's expect that buffer size is power of 2. So we are infact passing the actual correct
size ( MAX_DESCRIPTORS + 1 = 4096)
Regards,
Sricharan
--
"QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2019-06-18 16:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 14:20 [PATCH] dmaengine: qcom-bam: fix circular buffer handling Srinivas Kandagatla
2019-06-14 19:43 ` Andy Gross
2019-06-18 4:53 ` Vinod Koul
2019-06-18 7:13 ` Sricharan R
2019-06-18 14:49 ` Srinivas Kandagatla
2019-06-18 14:50 ` Srinivas Kandagatla
2019-06-18 14:56 ` Sricharan R
2019-06-18 15:12 ` Srinivas Kandagatla
2019-06-18 16:27 ` Sricharan R [this message]
2019-06-18 16:50 ` Srinivas Kandagatla
2019-06-19 17:50 ` Sricharan R
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